Igneous Or Sedimentary (Water Worn)

Limestone (River Pebble)

Sedimentary Calcium Carbonate (CaCO3)

Veined Limestone (Micrite) with Quartz/Calcite Veins

Calcium Carbonate (CaCO3) with Silicate or Carbonate inclusions

Sandstone (likely River-tumbled Picture Sandstone)

Arenite (predominantly SiO2 with iron oxide impurities)

Glauconitic Sandstone (Greensand)

Glauconitic quartz wacke or arenite

Conglomerate

Conglomerate (clastic sedimentary rock)

Satin Spar (Gypsum)

Hydrous Calcium Sulfate (CaSO4·2H2O)

Specular Hematite

Hematite (Fe2O3)

Calcite

Calcium Carbonate (CaCO3)

Pink Garnet (likely Almandine or Rhodolite)

Garnet Group (Fe3Al2(SiO4)3 to Mg3Al2(SiO4)3)

Quartz (Drusy/Crystalline)

Silicon Dioxide (SiO2)

Citrine

SiO2 (Silicon Dioxide)

Chalcedony (Agate)

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Almandine Garnet

Almandine, Fe3Al2(SiO4)3

Quartz / Calcite Vein Rock

Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3)

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Limonite-stained Granite

Felsic Plutonic Rock with Hydrated Iron Oxides

Garnet (Almandine/Pyrope)

Silicate Mineral (Group: X3Y2(SiO4)3 where X=Mg, Fe, Mn and Y=Al, Fe, Cr)

Limestone

Calcium Carbonate (CaCO3)

Limestone

Calcium Carbonate (CaCO3)

Basalt with Quartz Vein

Basalt (SiO2 vein inclusion)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Gold Ore

Native Gold (Au) in Matrix

Basalt (with possible iron oxide staining)

Mafic Igneous Rock (primarily Plagioclase and Pyroxene)

Limestone

Calcium Carbonate (CaCO3)

Conglomerate

Conglomerate (clastic sedimentary rock)

Granite Pebble

Granite (composed primarily of Quartz SiO2, Feldspar KAlSi3O8, and Mica)

Pumice

Pumice (Vesicular felsic extrusive igneous rock)

Pumice

Vesicular Rhyolite / Glassy Igneous Rock

Limestone

Calcium carbonate (CaCO3)

Dalmatian Stone

Peralkaline Feldsphathic Igneous Rock

Crushed Limestone (Gravel)

Calcium Carbonate (CaCO3)

Basalt (Weathered River Stone)

Basalt (Extrusive Mafic Igneous Rock)

Basalt (Beach Pebble)

Basalt (Aphanitic Mafic Igneous Rock)

Granite Cobble

Felsic Intrusive Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)

Limestone

Calcium Carbonate (CaCO3)

Blue Calcite

Calcium Carbonate (CaCO3)

Pyrite

Iron Disulfide (FeS2)

Chert (Jasper)

Silicon Dioxide (SiO2)

Yellow Chert (Gold-colored River Pebble)

Microcrystalline Quartz (SiO2) with Limonite/Goethite staining

Quartz Geode (Cracked Open Fragment)

Silicon Dioxide (SiO2)